#通过if语句处理多个列表
available_toppings = ['mushrooms','olives','green peppers',
					'pepperroni','pineaplle','extra cheese']
					
requested_toppings = ['mushrooms','french fries','extra cheese']

for requested_topping in requested_toppings:
	if requested_topping in available_toppings:
		print("Adding " + requested_topping + ".")
	else:
		print("Sorry,we don't hava " + requested_topping + ".")
	
print("\nFinished making pizza!")
